- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00713583
Carbidopa/Levodopa Combined With Behavioral Therapy for the Treatment of Cocaine Dependence
March 23, 2018 updated by: Joy Schmitz, The University of Texas Health Science Center, Houston
Contingency Management Plus Levodopa/Carbidopa for Treatment of Cocaine Dependence
Cocaine dependence is a major public health problem and the development of a treatment for this disorder is a priority.
To date, treatment interventions based on positive incentive principles have shown the strongest effects for improving substance use outcomes.
One such example is contingency management (CM) interventions in which nondrug rewards are used to compete with cocaine.
Recent evidence suggests that certain medications improve response to CM interventions, particularly agents that target dopamine reward systems in the brain.
A promising dopamine-enhancing medication is levodopa.
The study team has observed the strongest effects of levodopa when the medication is administered in the context of CM therapy, perhaps through mechanisms that enhance reward saliency.
The proposed study is designed to further evaluate this promising treatment approach.
Cocaine dependent outpatients will participate in a randomized, 2-group (levodopa vs. placebo), double-blind clinical trial.
CM will be behavioral therapy platform for both treatment groups.
The study will test the primary hypothesis that CM+levodopa will be more effective than CM+placebo in reducing cocaine use.
This study is expected to validate the usefulness of a new behavioral-pharmacological treatment approach for cocaine dependence.
Study Overview
Status
Completed
Conditions
Intervention / Treatment
Study Type
Interventional
Enrollment (Actual)
85
Phase
- Phase 2
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
-
-
Texas
-
Houston, Texas, United States, 77030
- The University of Texas Health Science Center at Houston
-
-
Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
16 years to 58 years (Adult)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Description
Inclusion Criteria:
- between 18 and 60 years of age
- meet Diagnostic and Statistical Manual of Mental Disorders, 4th. Edition (DSM-IV) criteria for current cocaine dependence.
- be in acceptable health on the basis of interview, medical history and physical exam.
Exclusion Criteria:
- current DSM-IV diagnosis of any psychoactive substance dependence other than cocaine, marijuana, or nicotine.
- have a DSM-IV axis I psychiatric disorder or neurological disease or disorder requiring ongoing treatment and/or making study participation unsafe.
- have significant current suicidal or homicidal ideation.
- have medical conditions contraindicating levodopa/carbidopa pharmacotherapy. Conditions include severe pulmonary disease (bronchial asthma, emphysema), cardiovascular disease (severe or history of myocardial infarction with residual arrhythmias), narrow angle glaucoma, melanoma, history of peptic ulcer, renal function impairment.
- taking medications known to have significant drug interactions with levodopa/carbidopa (e.g., monoamine oxidase (MAO) inhibitors, anticonvulsants, haloperidol, phenothiazines, selegiline, anesthetics).
- currently or recently (last 3 months) treated for substance use or another psychiatric condition.
- having conditions of probation or parole requiring reports of drug use to officers of the court.
- impending incarceration.
- pregnant or nursing for female patients.
- inability to read, write, or speak English.
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Quadruple
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Levodopa pharmacotherapy
Levodopa pharmacotherapy (800mg levodopa and 200mg carbidopa per day), cognitive behavioral therapy (CBT), and contingency management (CM).
|
800mg levodopa and 200mg carbidopa per day
Other Names:
Participants received individual cognitive behavioral therapy (CBT) in 50-minute weekly sessions.
These sessions were manual-driven and based on the relapse prevention model proposed by Marlatt and Gordon (1985).
Trained masters-level therapists, under the supervision of senior therapists and the principal investigator, worked with participants to teach them how to recognize and cope with risky situations that could influence their cocaine use through self-monitoring of situational craving and drug use stimuli, coping skills training, and lifestyle modifications.
An abstinence-based contingency management (CM) procedure was used.
Participants earned vouchers according to the reward schedule recommended by Budney and Higgins (1998), beginning at $2.50 for the first cocaine-negative urine.
For each consecutive cocaine-negative urine, voucher values increased by $1.25 with a $10 bonus given for provision of three consecutive cocaine-negative urines within a week.
A cocaine-positive urine or failure to provide a scheduled urine sample resulted in a reset of the schedule to the initial value of $2.50.
After provision of five negative urines, the voucher returned to the value prior to the reset.
Participants were able to redeem their vouchers for small amounts of cash (≤$25) or gift cards for goods and services.
|
Placebo Comparator: Placebo
Placebo, cognitive behavioral therapy (CBT), and contingency management (CM).
|
Placebo
Participants received individual cognitive behavioral therapy (CBT) in 50-minute weekly sessions.
These sessions were manual-driven and based on the relapse prevention model proposed by Marlatt and Gordon (1985).
Trained masters-level therapists, under the supervision of senior therapists and the principal investigator, worked with participants to teach them how to recognize and cope with risky situations that could influence their cocaine use through self-monitoring of situational craving and drug use stimuli, coping skills training, and lifestyle modifications.
An abstinence-based contingency management (CM) procedure was used.
Participants earned vouchers according to the reward schedule recommended by Budney and Higgins (1998), beginning at $2.50 for the first cocaine-negative urine.
For each consecutive cocaine-negative urine, voucher values increased by $1.25 with a $10 bonus given for provision of three consecutive cocaine-negative urines within a week.
A cocaine-positive urine or failure to provide a scheduled urine sample resulted in a reset of the schedule to the initial value of $2.50.
After provision of five negative urines, the voucher returned to the value prior to the reset.
Participants were able to redeem their vouchers for small amounts of cash (≤$25) or gift cards for goods and services.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Confirmed Abstinence From Cocaine as Assessed by Treatment Effectiveness Score (TES)
Time Frame: 12 weeks of treatment
|
The Treatment Effectiveness Score (TES) is the number of cocaine-negative urines collected out of the total scheduled urine tests for the 12-week trial (36 total scheduled urine tests per participant).
The mean number of cocaine-negative urines over all time points is reported in this outcome measure.
|
12 weeks of treatment
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Collaborators
Investigators
- Principal Investigator: Joy M Schmitz, PhD, University of Texas at Houston
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start
January 1, 2008
Primary Completion (Actual)
December 1, 2011
Study Completion (Actual)
December 1, 2011
Study Registration Dates
First Submitted
July 9, 2008
First Submitted That Met QC Criteria
July 9, 2008
First Posted (Estimate)
July 11, 2008
Study Record Updates
Last Update Posted (Actual)
April 23, 2018
Last Update Submitted That Met QC Criteria
March 23, 2018
Last Verified
March 1, 2018
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 1R01DA023608-01 (U.S. NIH Grant/Contract)
- DPMCDA (Other Identifier: NIDA)
- R01DA023608-01 (U.S. NIH Grant/Contract)
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Yes
Studies a U.S. FDA-regulated device product
No
product manufactured in and exported from the U.S.
No
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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